期刊
BLOOD
卷 98, 期 7, 页码 2028-2038出版社
AMER SOC HEMATOLOGY
DOI: 10.1182/blood.V98.7.2028
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资金
- NCI NIH HHS [T32CA09140] Funding Source: Medline
- NHLBI NIH HHS [T32 HL07775] Funding Source: Medline
- NIDDK NIH HHS [DK 54767] Funding Source: Medline
SH2-containing inositol 5 ' -phosphatase (SHIP) modulates the activation of immune cells after recruitment to the membrane by Shc and the cytoplasmic tails of receptors. A novel SHIP Isoform of approximately 104 kd expressed In primitive stem cell populations (s-SHIP) Is described. It was found that s-SHIP is expressed In totipotent embryonic stem cells to the exclusion of the 145-kd SHIP Isoform expressed in differentiated hematopoietic cells. s-SHIP Is also expressed In primitive hematopoietic stem cells, but not in lineage-committed hematopoietic cells. In embryonic stem cells, s-SHIP partners with the adapter protein Grb2 without tyrosine phosphorylation and is present constitutively at the cell membrane. It is postulated that s-SHIP modulates the activation threshold of primitive stem cell populations. (C) 2001 by The American Society of Hematology.
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